The ES3 is... less than stellar. I've found that using the stock profiles, running it less than 12pass leads to lots of banding. I'm sure you could create your own profiles and get better results, but ES3 ink just isn't as tested or dialed in as the SS21. It hasn't been reformulated in over a decade i'd assume, as it's the same product as the JV3 could run. the SS21 was reformulated for the JV33 heads, and seems to be a much better product.
That being said, the hardware on a JV33 is excellent if you do the most basic of maintenance to keep it running. It's a tank, and while not the fasted or prettiest machine, it runs forever.